A strain is a low-level taxonomic rank used at the
intraspecific level (within a species). While the majority of the members of the same species have very high similarity in their genomes, there occasionally is a proportion of the species that has a little different genome from the popular species group. This variability results in different strains on the species.
A harmless Staphylococcus
aureus may have a muted virulence gene. However, either due to mutation of the
gene or recombination with the harmful strain, a harmless Staphylococcus
aureus could easily turn virulent (harmful).
Los capilares rodean a las células y a los tejidos del cuerpo para aportar y absorber oxígeno, nutrientes y otras sustancias. Los capilares también conectan las ramas de las arterias y las ramas de las venas.
